Improvement in augers



line a: fr, Fig. 1. nal section of the saine.

UNITED STATES PATENT EEicE.

E. C. GILLETTE, OF BIGHFIELD, BRITISH COLUMBIA.

` IMPROVEMENT IN AUGERS.

Specification forming part of Letters Patent No. 46,554, dated March 14,1865.

To all whom it may concer-11,.-

Be it known that I, E. C. GILLETTE, of Richfield, in British Columbia,have invented a new and useful Improvement in Angers; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification, in which-- Figure 1 represents a side elevation ofmy invention. Fig. 2 is a transverse section of the same, taken in theplane indicated by the Fig. 3 is a partial longitudi Similar letters ofreference indicate like parts.

This invention consists in the application of a cam-sleeve, incombination with a slot in the lower end of the shaft, and with afiatnotched shank of the auger, in such a manner that the auger can bereadily fastened to or unfastend from the shaft whenever it may bedesired.

Boring large deep holes in timber is slow and laborious work,particularly on account of the large resistance which must be overcomeover and above what is caused by the action of the auger on the wood.This extra resistance must be overcome by extra labor consumed incarrying round with every turn of the auger the chips which becomewedged into the twists. After penetrating a few inches every turnbecomes more difficult, until soon no further progress can be made, andthe chips have to be removed, which is ei'ected by withdrawing theauger, when the chips are found jammed into the twists and ground topowder, while the metal is hot with friction. The severe strain to whichthe tools are thus exposed soon spoils them, and augers which have beenused any considerable length of time are generally found more or lessbent; also, one end of the tool being held by the wood and the other bythe hands which serve to turn the auger, makes it rather difficult tobore the hole truly and evenly.

These disadvantages .are obviated by the use of the standard A, which issupported by three (more or less) legs, and with an eye, a, throughwhich the shaft C passes. The auger B is secured in the lower slottedend of this shaft, and to effect this purpose it is provided with a datnotched shank, b, and it is fastened in its place by a cam-sleeve, c.This cam-sleeve works in a recess or groove in the shaft and in theshank ofthe auger, and the groove in the shaft is provided with inclinedplanes to correspond to the inclined planes of the cam-sleeve, and toform stops which prevent said sleeve being turned beyond a certain pointin either direction. The cam-sleeve is provided with two notches, d,(see Fig. 2,) equal in width to the thickness of -the shank b,and ofsuch a depth that when the sleeve is turned, until the notches registerwith the edges of the slot in the shaft, the auger can be withdrawn orintroduced, as the case may be. An additional sleeve, e, which slipsover the shaft C, is made adjustable in the desired position. Thissleeve serves to keep the upper end of the shank b of the auger in theslot of the shaft and prevent it being tilted spontaneously.

The shaft C, which passes up through the eye in the standard A, forms aguide for the same and for the auger, whereby the operator is enabled tobore an even and true hole, and.`

the auger can be made with two blades only, one on either side,dispensing with all the extra twists which are necessary in ordinaryangers to serve as guides.

By making on the shaft C a graduated scale the depth ofthe hole can bedetermined at any moment without lifting out the auger.

What 1 claim as new, and desire to secure by Letters Patent, is

The cam-sleeve 0, in combination with the slotted shaft C and with thefiat notched shank b of the auger, constructed and operating in themanner and for the purpose substantially as set forth.

E. U. GILLETTE.

IVitnesses:

I. V. LEE, DANL. B. OHrsnoLM.

